Question

# 1. You are calculating the rate of reaction for A+ + B- → AB. Your tangent...

1. You are calculating the rate of reaction for A+ + B- → AB. Your tangent line slopes are from graphs of absorbance of A+ versus time in minutes. You have the following experimental data:

 Trial [A+] in M [B-] in M Tangent Line Slope in Abs/min 1 1.00 0.380 -0.540 2 1.00 1.00 -1.89 2 0.25 0.380 -0.170

Convert the slope of Trial 1 to a rate with units of M/min. The molar absorptivity of A+ is 38700 M-1cm-1.

2.

Using the data from Question 2 (copied below), determine the reaction order with respect to species A+. You will need to convert the other tangent line slopes into rates of reaction in order to do this.

Question 2: You are calculating the rate of reaction for A+ + B- → AB. Your tangent line slopes are from graphs of absorbance of A+ versus time in minutes. You have the following experimental data:

#### Homework Answers

Answer #1

1.

Slope of trial 1

Rate ( in M/min)

2.

For trial 1 the rate ( in M/min)

For trial 3 the rate ( in M/min)

For trials 1 and 3, the concentration of B- is held constant. The concentration of A+ is quadrapuled from 0.25 M to 1.00 M. The rate of the reaction increases from to

For trial 1

....(1)

For trial 2

....(2)

Divide equation (1) with equation (2)

Take log on both sides

The order of the reaction with respect to A+ is approximately equal to 1.

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